CN217501994U - High-speed vacuum pump - Google Patents

Abstract

The utility model discloses a high-speed vacuum pump, including the pump body, establish anisotropic synchronous rotation and intermeshing's first rotor part and second rotor part in, first rotor part one end is equipped with first bearing part and first drive wheel part, and first bearing part inner circle is connected with first rotor part, and the outer lane is connected with first drive wheel part, and second rotor part one end is equipped with the second drive wheel part of being connected with the transmission of first drive wheel part, and first drive wheel part is greater than second drive wheel part, and first drive wheel part can use first rotor part pivot as the rotation of axes. This application adopts the drive wheel group to change the rotational speed ratio between drive unit rotation main shaft and rotor part to mechanical system improves the rotational speed, and the rotatable cover of initiative drive wheel part is established and is effectively reduced the vacuum pump size on the passive rotor part that rotates, makes simultaneously to produce syntropy rotation between it, reduces the relative speed between drive wheel part inner bearing part outer lane and inner circle, reduces the friction and generates heat, increase of service life.

Description

High-speed vacuum pump

Technical Field

The utility model relates to a vacuum pump technical field especially relates to a high-speed vacuum pump.

Background

Roots vacuum pump and screw vacuum pump all belong to a positive displacement vacuum pump, rotate through two intermeshing's rotor part and realize the transfer of pump chamber intracavity gas. For example, roots vacuum pumps rotate synchronously with meshed rotors in a pump chamber, the meshed rotors being configured to close the connection of the inlet and outlet ports during rotation so that a single rotation of the meshed rotors displaces a volume of gas in the pump chamber other than the volume of the rotors. The volume is the basic air suction capacity of the Roots vacuum pump, and for the screw vacuum pump, the meshed screw rotors synchronously rotate in the pump cavity, the first-stage spiral ring of the screw rotors seals the air in the cavity and transmits the air to the exhaust port through the spiral, the air taken away by the first-stage spiral ring, namely the volume of the air except the volume of the spiral rotor subtracted from the screw pump cavity corresponding to the first-stage spiral ring can be discharged by one rotation of the spiral ring, and the volume is the basic air suction capacity of the screw vacuum pump.

Therefore, it can be seen from the above description that the basic pumping capacities of the roots vacuum pump and the screw vacuum pump are mainly determined by the volumes of the pump cavities and the rotating speeds of the meshed rotors (the actual pumping capacity is smaller than the basic pumping capacity, and the main factors are the clearance between the meshed rotors, the clearance between the pump cavities and the meshed rotors, and the clearance backflow caused by the pressure difference between the air inlet and the air outlet, so as to cause the pumping efficiency ratio, which is about 85-90% and generally cannot be changed).

In practice, it is desirable for all customers and manufacturers that the roots vacuum pump or screw vacuum pump be of small overall dimensions, but nevertheless meet very high pumping capacities. From the customer perspective, vacuum pump under the equal air exhaust ability, the volume is less, then more convenience is arranged in then use, and the space that occupies is just less, and subsequent maintenance, installation, change are also more convenient. In particular, the systems using vacuum technology in more and more industrial applications are now of modular construction, and as the volume of the vacuum pump is smaller, the space efficiency is better utilized in the modular design of the process system. For manufacturers, the smaller the volume of the vacuum pump with the same air exhaust capacity is, the consumed raw materials and the processing time are inevitably reduced, the labor amount of assembly is further reduced, the production cost is greatly reduced, and the competitive advantage of products is improved.

Therefore, in the vacuum pump with the same air suction capacity, the overall size of the vacuum pump can be reduced while the air suction capacity is met only by increasing the rotating speed. For example, if the rotational speed of a roots vacuum pump or a screw vacuum pump with the same air suction capacity can be increased by 1.5 times, the external dimension of the roots vacuum pump or the screw vacuum pump is reduced by 16%, the overall weight of the roots vacuum pump or the screw vacuum pump is reduced by 25%, the material cost of the roots vacuum pump or the screw vacuum pump is directly reduced by about 20%, and if the rotational speed of the roots vacuum pump or the screw vacuum pump can be increased by 2.0 times, the external dimension of the roots vacuum pump or the screw vacuum pump is reduced by 25%, the overall weight of the roots vacuum pump or the screw vacuum pump is reduced by 35%, and the material cost of the roots vacuum pump or the screw vacuum pump is directly reduced by about 27%.

At present, all Roots vacuum pumps or screw vacuum pumps are improved in an electric frequency conversion control mode, and a plurality of manufacturers use a frequency converter to regulate the rotating speed of a motor and improve the rotating speed of the motor so as to realize high-speed operation of the vacuum pumps. Although this mode can be very simple improvement roots vacuum pump or screw vacuum pump rotational speed, but have two very big hidden danger problems, at first, be equipped with the converter and be equivalent to increase a little complete regulator cubicle (will have control switch, converter, fixed box, cable, signal control etc.) on mechanical vacuum pump, very expensive on the cost, especially at present stage, electrical components's price is more and more expensive, and the cost of the regulator cubicle of often an integrated converter has almost reached vacuum pump 40% of its own cost. And the converter itself need dispel the heat, and can't be explosion-proof, even the converter that is little again in order additionally to occupy the space outside the vacuum pump, consequently make vacuum pump occupation space grow on the contrary. Secondly, after the rotating speed of a motor of the pump is increased by adopting a frequency converter, part of mechanical structures in the vacuum pump cannot meet the requirement of high rotating speed, such as a shaft seal, a common lip seal and a mechanical seal, have certain limitation on the rotating speed, and generally cannot exceed 3000rpm, if the rotating speed is too high and reaches 4500rpm or 6000rpm, the friction quantity is greatly increased, the abrasion is seriously aggravated, the heat productivity is increased, the service life is greatly reduced, and finally serious oil leakage occurs. For example, the motor and the motor of a general vacuum pump are all common motors, the maximum rotating speed is 3000rpm, the speed is regulated to 4500rpm or 6000rpm through a frequency converter, the output torque of the motor is greatly reduced, meanwhile, the bearing of the motor is difficult to bear the high rotating speed, the service life is greatly reduced, and the dynamic balance of the motor shaft cannot meet the high-speed requirement. If the pump is replaced by a customized high-speed motor, the cost is greatly increased, and the manufacturing concept that the pump is small in size, high in rotating speed and competitive in cost is deviated.

Therefore, in combination with the above-mentioned technical problems, a new technical solution is needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at solves the problem that exists among the prior art that provides in the background art, a high rotational speed vacuum pump is provided, change the rotational speed ratio between drive disk assembly rotation main shaft and the rotor part through adopting the transmission wheelset, and then improve the rotational speed with mechanical mode, and simultaneously, the rotatable cover of the drive wheel assembly of great size is established on passive pivoted rotor part, can effectively reduce the vacuum pump size, and simultaneously, can also make and produce the syntropy rotation between this drive wheel assembly and the passive pivoted rotor part, and then reduce the relative rotational speed of drive wheel assembly inner bearing part between outer lane and inner circle, and then reduce the friction and generate heat, the life of extension bearing part.

In order to achieve the purpose of the utility model, the utility model provides a high-speed vacuum pump, which comprises a pump body, a first rotor component and a second rotor component which are meshed with each other are arranged in the pump body, the first rotor component and the second rotor component synchronously rotate, the rotating direction between the first rotor component and the second rotor component is opposite, one end of the first rotor component is provided with a first bearing component and a first transmission wheel component, the inner ring of the first bearing component is connected with the first rotor component, the outer ring of the first bearing component is connected with the first transmission wheel component, one end of the second rotor component is provided with a second transmission wheel component, the second transmission wheel component is in transmission connection with the first transmission wheel component, the diameter of the first transmission wheel component is larger than that of the second transmission wheel component, the first transmission wheel member is capable of being driven to rotate about a rotation shaft of the first rotor member.

Further, the axial direction of the first rotor component and the axial direction of the second rotor component are respectively consistent with the length direction of the pump body, a cavity is arranged in the pump body, the first rotor component and the second rotor component are respectively arranged in the cavity, two ends of the first rotor component are respectively in rotatable connection with two ends of the pump body in the length direction, and two ends of the second rotor component are respectively in rotatable connection with two ends of the pump body in the length direction.

Furthermore, two ends of the first rotor component in the axial direction are respectively a first synchronization end and a mating end, the first synchronization end and the mating end respectively penetrate through two ends of the pump body in the length direction, a third transmission wheel component is arranged on the first synchronization end, and an inner ring of the first bearing component is connected with the mating end; two ends of the second rotor component in the axial direction are respectively a second synchronizing end and a driven end, the second synchronizing end and the driven end respectively penetrate through two ends of the pump body in the length direction, a fourth transmission wheel component is arranged on the second synchronizing end, and the second transmission wheel component is connected with the driven end; the third transmission wheel component is in transmission connection with the fourth transmission wheel component.

Further, the inner ring of the first bearing part is sleeved on the matching end, and the first transmission wheel is sleeved on the outer ring of the first bearing part.

Further, the first transmission wheel component and the second transmission wheel component are in gear transmission connection; and/or the third gear wheel component with gear drive connects between the fourth gear wheel component, the third gear wheel component with the diameter is the same between the fourth gear wheel component.

Further, the first synchronizing end and/or the mating end and the pump body are/is rotatably connected through a second bearing component; and/or the second synchronizing end and/or the driven end is/are rotatably connected with the pump body through a second bearing component.

Furthermore, the sealing box component is arranged on one side, provided with the first driving wheel component and the second driving wheel component, of the pump body, a first accommodating cavity is formed in the sealing box component, a first opening is formed in one side, facing the pump body, of the sealing box component, the first opening is communicated with the first accommodating cavity, and the first driving wheel component and the second driving wheel component are located in the first accommodating cavity; the seal box component is provided with a shaft hole, the axial direction of the shaft hole is consistent with the length direction of the pump body, the shaft hole is arranged corresponding to the first rotor component, one end of the shaft hole is communicated with the first accommodating cavity, and the other end of the shaft hole penetrates through the seal box component; the driving part is arranged on one side, far away from the pump body, of the sealing box part, the transmission shaft is located in the shaft hole, and two ends of the transmission shaft are respectively connected with the first transmission wheel part and a rotating main shaft of the driving part.

Furthermore, a through hole is formed in the transmission shaft, one end of the through hole is communicated with the first bearing part, and the other end of the through hole is communicated with the outside of the transmission shaft.

Furthermore, the side wall of the shaft hole is provided with a groove structure, and a framework oil seal is arranged in the groove structure.

Further, the end cover is arranged on one side of the third transmission wheel component and one side of the fourth transmission wheel component, a second containing cavity is formed in the end cover, the end cover faces to one side of the pump body, a second opening is formed in the end cover and communicated with the second containing cavity, and the third transmission wheel component and the fourth transmission wheel component are located in the second containing cavity.

Compared with the prior art, the vacuum pump with high rotating speed has at least one or more of the following beneficial effects:

according to the vacuum pump with the high rotating speed, the two mutually meshed rotor components are designed to synchronously rotate, so that the two rotor components can move in the same rotating speed and opposite directions when any one rotor component is driven to rotate; the transmission wheel set is adopted for transmission between one rotor component and the rotating main shaft of the driving component, the rotating speed ratio between the rotating main shaft and the rotor component can be changed by changing the diameter ratio between the transmission wheel components in the transmission wheel set, when high-speed rotation is needed, the rotating speed can be improved in a mechanical mode only by selecting a large-size driving transmission wheel or a small-size driven transmission wheel, and expensive components such as a frequency converter and an electrical cabinet are not needed, so that the cost can be effectively reduced, and the miniaturization design of a vacuum pump is facilitated; by adopting a mechanical speed change mode, the rotating shaft of the driving motor can realize high-speed rotation of the rotor part without large rotating speed, and the high-speed air extraction is met, and meanwhile, damage or overload operation to some mechanical structures such as a shaft seal and the like can be avoided, so that the service life and the stability of the vacuum pump are improved; the driving transmission wheel is sleeved on the rotor part which rotates passively, the structure is simple, the number of parts can be reduced, the axial size of the vacuum pump can be effectively reduced, meanwhile, the transmission wheel part and the rotor part which rotates passively can rotate in the same direction, the relative rotating speed of a bearing part in the transmission wheel part between an outer ring and an inner ring is reduced, the friction heating is reduced, and the service life of the bearing part is prolonged; the installation mode is simple and convenient, the positioning is accurate, and the driving wheels with different sizes can be replaced without replacing any other components to realize different rotating speed changes.

Drawings

FIG. 1 is a schematic axial sectional view of a high-speed vacuum pump provided in an embodiment of the present application in a horizontal direction;

FIG. 2 is an enlarged schematic view at I of FIG. 1;

FIG. 3 is a schematic vertical cross-sectional view of a high-speed vacuum pump according to an embodiment of the present application;

fig. 4 is a schematic structural view of a high-speed vacuum pump provided in an embodiment of the present application, in a radial cross section in a vertical direction at an end cover.

Wherein 10-pump body, 11-pump body, 12-bearing end cap, 20-first rotor component, 21-first synchronizing end, 22-mating end, 23-bearing sleeve portion, 24-first stop surface, 25-fastener, 30-second rotor component, 31-second synchronizing end, 32-driven end, 40-first bearing component, 50-first transmission wheel component, 51-annular groove, 52-second stop surface, 53-bearing press plate, 60-second transmission wheel component, 70-third transmission wheel component, 80-fourth transmission wheel component, 90-second bearing component, 100-seal box component, 101-groove structure, 110-transmission shaft, 111-through hole, 120-driving component, 121-rotation main shaft, 130-framework oil seal and 140-end cover.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Examples

The present embodiment provides a high-speed vacuum pump comprising a pump body 10, and two rotor components engaged with each other are disposed in the pump body 10, which are respectively defined as a first rotor component 20 and a second rotor component 30, as shown in fig. 1. A pump body 10 is schematically shown, which is mainly composed of a hollow pump body 11 and bearing end caps 12 disposed at both ends of the pump body 11, wherein an inner cavity is formed in the pump body 11, and the first rotor component 20 and the second rotor component 30 are respectively disposed in the inner cavity. The axial direction of the first rotor member 20 and the axial direction of the second rotor member 30 are respectively aligned with the longitudinal direction of the pump body 10, both ends of the first rotor member 20 are respectively rotatably connected to the bearing caps 12 at both ends in the longitudinal direction of the pump body 10, and both ends of the second rotor member 30 are respectively rotatably connected to the bearing caps 12 at both ends in the longitudinal direction of the pump body 10. Further, two ends of the first rotor member 20 in the axial direction are respectively defined as a first synchronization end 21 and a mating end 22, the first synchronization end 21 and the mating end 22 respectively penetrate through two ends of the pump body 10 in the length direction, that is, the bearing caps 12 at the two ends, and the first synchronization end 21 and the mating end 22 are respectively rotatably connected with the two bearing caps 12 of the pump body 10 through a bearing member. The two ends of the second rotor component 30 in the axial direction are respectively defined as a second synchronizing end 31 and a driven end 32, the second synchronizing end 31 and the driven end 32 respectively penetrate through the two ends of the pump body 10 in the length direction, that is, the bearing end caps 12 at the two ends, and the second synchronizing end 31 and the driven end 32 are respectively rotatably connected with the two bearing end caps 12 of the pump body 10 through the bearing components. The bearing component is defined as a second bearing component 90, but it should be noted that the second bearing component 90 should be understood broadly and is a general term, and is not limited to the same type of bearing component, for example, the same type of bearing component or different types of bearing components may be used between the first rotor component 20 and the second rotor component 30 and the bearing end cap 12; for another example, the same type of bearing component may be used between the first rotor component 20 or the second rotor component 30 and the two bearing end caps 12, or different types of bearing components may be used. It should be noted that fig. 1 only shows schematic structures of the first rotor component 20 and the second rotor component 30, and specific structures of the first rotor component 20 and the second rotor component 30 can be designed as required in a specific vacuum pump, for example, in a roots vacuum pump, the first rotor component 20 and the second rotor component 30 can be respectively an intermeshing impeller shaft, and in a screw vacuum pump, the first rotor component 20 and the second rotor component 30 can be respectively an intermeshing screw.

The first rotor component 20 and the second rotor component 30 rotate synchronously, and the rotation direction of the first rotor component 20 and the second rotor component 30 is opposite. As shown in fig. 1 and 4, a synchronous rotation mode is schematically shown. The first synchronizing end 21 and the second synchronizing end 31 penetrate through the parts of the bearing end cover 12, which are respectively provided with a gear wheel component, which are defined as a third gear wheel component 70 and a fourth gear wheel component 80, the third gear wheel component 70 is in transmission connection with the fourth gear wheel component 80, and the diameters of the third gear wheel component 70 and the fourth gear wheel component 80 are the same. Preferably, the third gear wheel component 70 and the fourth gear wheel component 80 are respectively of a gear structure with the same shape and size, and the third gear wheel component 70 and the fourth gear wheel component 80 are in gear transmission connection, so that when any one of the first rotor component 20 or the second rotor component 30 rotates, the other rotor component can be driven to do meshing motion with the same rotation speed and opposite rotation directions. Of course, the third driving wheel component 70 and the fourth driving wheel component 80 are not limited to gears, but also can be other driving wheel structures, such as pulleys or sprockets, etc., and can also realize synchronous reverse rotation. Of course, the third gear wheel component 70 and the fourth gear wheel component 80 may be fixed to the rotor components by sleeving the rotor components, for example, by fastening the rotor components with a key slot or by expanding the rotor components, or by fastening the end portions of the synchronizing ends of the rotor components with fasteners such as screws or by welding.

As shown in fig. 1-3, the mating end 22 of the first rotor member 20 is provided with a bearing member and a gear member, which are defined as a first bearing member 40 and a first drive wheel member 50, respectively. The inner race of the first bearing member 40 is connected to the mating end 22 of the first rotor member 20 and the outer race of the first bearing member 40 is connected to the first drive wheel member 50. Preferably, a step-like structure is provided at the mating end 22 of the first rotor member 20, that is, the diameter of the mating end 22 near the end is smaller, which is defined as a bearing sleeve portion 23, and the diameter difference between the mating end 22 and the other portion far from the end forms a stop surface, which is defined as a first stop surface 24, as shown in fig. 2. The inner ring of the first bearing component 40 is sleeved on the bearing sleeve portion 23, and then the first bearing component 40 is far away from the first stopping surface 24 side, and the inner ring of the first bearing component 40 is firmly pressed against and locked on the first stopping surface 24 through a fastener 25 such as a nut, so that the first bearing component 40 is firmly fixed on the first rotor component 20. Of course, the inner race of the first bearing member 40 may be fixedly connected to the end portion side of the mating end 22 of the first rotor member 20 by fastening with a fastening member such as a screw or by welding.

The first drive wheel member 50 is preferably fitted over the outer race of the first bearing member 40. As shown in fig. 2, an annular groove 51 is formed in an inner wall of the central through hole of the first driving wheel member 50, and the annular groove 51 penetrates through the first driving wheel member 50 and faces one side of the pump body 10, so that the inner wall of the central through hole of the first driving wheel member 50 forms a step structure, and further forms a stop surface, which is defined as a second stop surface 52. The shape and size of the annular groove 51 match the outer race of the first bearing member 40, and when the first drive wheel member 50 is fitted over the first bearing member 40, the first bearing member 40 is located in the annular groove 51. Correspondingly, a bearing pressure plate 53 is disposed on one side of the first driving wheel member 50 facing the pump body 10, and the bearing pressure plate 53 and the first driving wheel member 50 can be fixedly connected through a fastening member such as a screw. The bearing pressure plate 53 extends to one side of the outer ring of the first bearing component 40, so that the outer ring of the first bearing component 40 is firmly fixed in the annular groove 51, namely, the first transmission wheel component 50 is firmly sleeved on the outer ring of the first bearing component 40. Of course, the first drive wheel member 50 may be fixedly connected to the outer ring side of the first bearing member 40 by fastening with a fastening member such as a screw, welding, or the like.

As shown in fig. 1, the driven end 32 of the second rotor member 30 is provided with a gear wheel member, which is defined as a second gear wheel member 60. The second driving wheel member 60 is fixedly connected to the driven end 32. The second transmission wheel component 60 is in transmission connection with the first transmission wheel component 50. The diameter of the first drive wheel member 50 is greater than the diameter of the second drive wheel member 60. Preferably, the first driving wheel part 50 is in gear transmission connection with the second driving wheel part 60, that is, the first driving wheel part 50 is a gear with a large size, and the second driving wheel part 60 is a gear with a small size, so that when the first driving wheel part 50 rotates, the second driving wheel part 60 can be driven to rotate faster, and the constant-speed air pumping capacity of 0.6-2 times under the original basic capacity can be provided without any electric element (frequency converter) control, thereby widening the air pumping range of the original pump. Of course, the first and second drive wheel assemblies 50 and 60 are not limited to gears, but may be other drive wheel configurations, such as pulleys or sprockets, etc. Of course, the second transmission wheel component 60 can be fastened to the two rotor components by fitting over the second rotor component 30, for example, by using a key slot or expansion, or can be fastened or welded to the end of the driven end 32 of the second rotor component 30 by using a fastener such as a screw.

In a further embodiment, the high-speed vacuum pump further comprises a sealed box part 100, a drive shaft 110 and a drive part 120, as shown in fig. 1. The seal box member 100 is provided on the side of the pump body 10 where the first and second gear members 50 and 60 are provided. A first accommodating cavity is formed in the seal box component 100, a first opening is formed in one side, facing the pump body 10, of the seal box component 100, the first opening is communicated with the first accommodating cavity, and the first driving wheel component 50 and the second driving wheel component 60 are both located in the first accommodating cavity. The seal box component 100 is provided with a shaft hole, an axial direction of the shaft hole is consistent with a length direction of the pump body 10, the shaft hole is arranged corresponding to the first rotor component 20, one end of the shaft hole is communicated with the first accommodating cavity, and the other end of the shaft hole penetrates through the seal box component 100. The driving member 120 is preferably a motor, and is disposed on a side of the seal box member 100 away from the pump body 10, the transmission shaft 110 is located in the shaft hole, and two ends of the transmission shaft 110 are respectively connected to the first driving wheel member 50 and a main rotating shaft 121 of the driving member 120. When the rotation main shaft 121 of the driving member 120 is rotated in this way, the first transmission wheel member 50 is rotated about the rotation axis of the first rotor member 20 by the transmission of the transmission shaft 110. A through hole 111 is provided in the drive shaft 110, one end of the through hole 111 communicates with the first bearing member 40, and the other end of the through hole 111 communicates with the outside of the drive shaft 110, and lubricating oil or the like can be added to the first bearing member 40 through the through hole 111.

A groove structure 101 is further disposed on a side wall of the shaft hole to serve as a sealing oil chamber for containing sealing oil to lubricate a rotating main shaft 121 of the driving part 120. Correspondingly, in order to prevent the sealing oil in the sealing oil cavity from leaking, a framework oil seal 130 is further arranged in the groove structure 101 and used for sealing the gap between the groove structure 101 and the transmission shaft 110. As shown in fig. 1 and fig. 2, in order to facilitate installation and adding sealing oil, the groove structure 101 is of a split design, that is, a side wall of the groove structure 101 facing the driving part 120 is of a split detachable structure.

Further, an end cover 140 is further disposed on one side of the pump body 10, where the third gear wheel component 70 and the fourth gear wheel component 80 are disposed, for sealing the third gear wheel component 70 and the fourth gear wheel component 80. A second accommodating cavity is formed in the end cover 140, a second opening is formed in one side of the end cover 140 facing the pump body 10, the second opening is communicated with the second accommodating cavity, and the third transmission wheel part 70 and the fourth transmission wheel part 80 are both located in the second accommodating cavity.

It should be noted that if an additional driving wheel mounting method is adopted instead of the above-mentioned arrangement of the first driving wheel member 50, separate bearings are provided at both ends of the first driving wheel member 50 as the driving wheel and are separately fixed. In this case, the distance between the centers of the driving transmission wheel and the second transmission wheel part 60 as driven transmission wheel and the distance between the centers of the third transmission wheel part 70 and the fourth transmission wheel part 80 as synchronous transmission wheel may be different or the same, the driving transmission wheel can be placed at any position, the position is relatively flexible, but in order to ensure the support of the driving transmission wheel and the fixation of the center distance, an additional driving shaft is added, the driving shaft is installed with the driving transmission wheel, the front and the back need to be fixed by bearings, an additional cover plate needs to be added for installing the bearings, the cover plate is connected to the original bearing end cap 12 to ensure the position degree, after the cover plate is installed, the front bearing is installed, the driving shaft is installed, the driving transmission wheel is installed, the rear bearing is installed, finally the seal box component 100 is installed, and the driving component 120 is connected. The structure is very complicated can be seen to this kind of mode, and the part is very many, and the apron that increases the installation initiative drive wheel moreover can lead to the motor side of original vacuum pump to elongate very much, and newly-increased apron must can cause the influence to the lubrication of bearing in the bearing end cover 12 simultaneously. What is more critical is that if the customer needs to transfer the drive ratio, if do not change the centre-to-centre spacing of drive wheel, then the size of initiative drive wheel and driven drive wheel must change, then original apron probably just can't use, if change the centre-to-centre spacing, then the position degree must change, then the apron also can't use. Therefore, the driving transmission wheel component is not suitable for the application of small volume, high rotating speed and variable speed. In the installation manner of the driving transmission wheel provided by this embodiment, the center distance between the driving transmission wheel and the driven transmission wheel is completely consistent with the center distance between the two rotor components. The driving transmission wheel is accurately arranged on one meshed rotor component, and the driving transmission wheel and the meshed rotor component have extremely high concentricity due to the fact that the driving transmission wheel is fixed through the bearing. If a gear structure is adopted as the transmission wheel, the center distance position of the two rotor parts can be completely determined, the precision is very high, and the position degree of the two variable speed transmission wheels can be very accurate.

During the actual rotation, the first bearing member 40, such as a ball bearing, mounted on the drive transmission wheel, is not rotationally synchronized between its inner and outer races. It will be appreciated that the basic function of the bearing assembly is that the inner race of the bearing assembly rotates at high speed with the shaft whilst the outer race is fixed within the bearing cavity and does not rotate. The first bearing member 40, now mounted in the drive transmission wheel, rotates at its inner race with the first rotor member 20 at a high speed, which is equivalent to the speed at which the rotor members rotate, which is equivalent to the speed of rotation of the synchronous transmission wheel, which is equivalent to the speed of rotation of the driven transmission wheel. The outer ring of the first bearing component 40 installed in the driving transmission wheel rotates along with the driving transmission wheel, and the two rotating directions of the inner ring and the outer ring of the first bearing component 40 are consistent, at this time, if we consider the rotation of the driving transmission wheel to be relatively static, the rotating speed of the inner ring of the first bearing component 40 installed in the driving transmission wheel is the differential speed of the speed changing gear. The relative rotational speed of the bearing components with respect to the stationary outer race of the bearing is much lower than that of the bearing components held in the end caps of the bearing cavity. Therefore, the first bearing member 40 in the present embodiment generates a relatively low amount of frictional heat, and has a relatively long service life.

The transmission shaft 110 is an independent shaft, one side of the transmission shaft is fixed with the driving transmission wheel through concentric circles and fixed by bolts to realize concentric synchronous rotation, and the other side of the transmission shaft is nested in the rotating main shaft 121 of the driving part 120 to realize synchronous rotation through a key of a motor. One side of the transmission shaft 110 is fixed on the driving transmission wheel, the driving transmission wheel is positioned by the first bearing component 40, the concentricity with the rotor component is ensured, the other side of the transmission shaft is nested concentrically with the rotating main shaft 121 and is fixed with the rotating main shaft 121 in a key mode, the driving component 120 can be fixedly connected with one side of the sealing box component 100 through a flange disc and the like, the installation direction of the driving component 120 can be determined through a positioning pin and the like, and therefore the rotating main shaft 121, the transmission shaft 110 and the driving transmission wheel are ensured to be coaxially arranged with the first rotor component 20, and high concentricity during high-speed rotation is ensured.

Since the rotation speed of the driving member 120 is consistent with the rotation speed of the transmission shaft 110, and the rotation speed of the rotor member is inconsistent, the rotation speed of the motor is typically 3000rpm, and the rotation speed of the rotor member can reach 4500 and 6000rpm when the transmission speed of the transmission wheel set is changed. The rotating speed of the transmission shaft 110, i.e. the shaft seal, is only 3000rpm, so that the rotating speed of the shaft seal is kept low while the rotating speed of the rotor part is increased, and the service life of the seal is ensured not to be shortened due to the increase of the rotating speed.

Compared with the prior art, the high-rotation-speed vacuum pump has the advantages that the two mutually meshed rotor components are synchronously rotated, so that the two rotor components can move in the same rotation speed and opposite directions when any one of the rotor components is driven to rotate; the transmission wheel set is adopted for transmission between one of the rotor components and the rotating main shaft 121 of the driving component 120, the rotating speed ratio between the rotating main shaft 121 and the rotor components can be changed by changing the diameter ratio between the transmission wheel components in the transmission wheel set, when high-speed rotation is needed, the rotating speed can be mechanically increased only by selecting a large-sized driving transmission wheel or a small-sized driven transmission wheel, and expensive components such as a frequency converter and an electrical cabinet are not needed, so that the cost can be effectively reduced, and the miniaturization design of a vacuum pump is facilitated; by adopting a mechanical speed change mode, the rotating shaft of the driving motor can realize high-speed rotation of the rotor part without large rotating speed, and the high-speed air extraction is met, and meanwhile, damage or overload operation to some mechanical structures such as a shaft seal and the like can be avoided, so that the service life and the stability of the vacuum pump are improved; the driving transmission wheel is sleeved on the rotor part which rotates passively, the structure is simple, the number of parts can be reduced, the axial size of the vacuum pump can be effectively reduced, meanwhile, the transmission wheel part and the rotor part which rotates passively can rotate in the same direction, the relative rotating speed of a bearing part in the transmission wheel part between an outer ring and an inner ring is reduced, the friction heating is reduced, and the service life of the bearing part is prolonged; the installation mode is simple and convenient, the positioning is accurate, and the driving wheels with different sizes can be replaced without replacing any other components to realize different rotating speed changes.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

In this document, the terms front, back, upper, lower and the like in the drawings are used for the sake of clarity and convenience only for the components are located in the drawings and the positions of the components relative to each other. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The embodiments and features of the embodiments described herein above may be combined with each other without conflict.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A high speed vacuum pump, characterized in that it comprises a pump body (10), a first rotor component (20) and a second rotor component (30) that are engaged with each other are provided in the pump body (10), the first rotor component (20) and the second rotor component (30) rotate synchronously with each other, the rotation direction between the first rotor component (20) and the second rotor component (30) is opposite, one end of the first rotor component (20) is provided with a first bearing component (40) and a first transmission wheel component (50), the inner ring of the first bearing component (40) is connected with the first rotor component (20), the outer ring of the first bearing component (40) is connected with the first transmission wheel component (50), one end of the second rotor component (30) is provided with a second transmission wheel component (60), and the transmission connection between the second transmission wheel component (60) and the first transmission wheel component (50), the diameter of the first transmission wheel component (50) is larger than that of the second transmission wheel component (60), and the first transmission wheel component (50) can be driven to rotate by taking the rotating shaft of the first rotor component (20) as an axis.

2. A high-speed vacuum pump according to claim 1, wherein the axial direction of the first rotor member (20) and the axial direction of the second rotor member (30) respectively coincide with the longitudinal direction of the pump body (10), the pump body (10) has an inner cavity, the first rotor member (20) and the second rotor member (30) are respectively disposed in the inner cavity, both ends of the first rotor member (20) are respectively rotatably connected with both ends of the pump body (10) in the longitudinal direction, and both ends of the second rotor member (30) are respectively rotatably connected with both ends of the pump body (10) in the longitudinal direction.

3. A high-speed vacuum pump according to claim 2, wherein the first rotor member (20) has a first synchronizing end (21) and a mating end (22) at opposite ends in the axial direction thereof, the first synchronizing end (21) and the mating end (22) extend through opposite ends in the longitudinal direction of the pump body (10), the first synchronizing end (21) is provided with a third gear wheel member (70), and the inner race of the first bearing member (40) is connected to the mating end (22);

two ends of the second rotor component (30) in the axial direction are respectively a second synchronizing end (31) and a driven end (32), the second synchronizing end (31) and the driven end (32) respectively penetrate through two ends of the pump body (10) in the length direction, a fourth transmission wheel component (80) is arranged on the second synchronizing end (31), and the second transmission wheel component (60) is connected with the driven end (32);

the third transmission wheel component (70) is in transmission connection with the fourth transmission wheel component (80).

4. A high-speed vacuum pump according to claim 3, wherein the inner race of the first bearing member (40) is arranged to fit over the mating end (22), and the first drive pulley is arranged to fit over the outer race of the first bearing member (40).

5. A high-speed vacuum pump according to claim 3, wherein the first drive wheel member (50) and the second drive wheel member (60) are in geared connection; and/or

Third gear wheel spare (70) with gear drive connects between fourth gear wheel spare (80), third gear wheel spare (70) with the diameter is the same between fourth gear wheel spare (80).

6. A high-speed vacuum pump according to claim 3, characterized in that the rotatable connection between the first synchronizing end (21) and/or the mating end (22) and the pump body (10) is through a second bearing member (90); and/or

The second synchronizing end (31) and/or the driven end (32) is/are rotatably connected to the pump body (10) via a second bearing part (90).

7. A high-speed vacuum pump according to claim 5, further comprising a sealing box component (100), a transmission shaft (110) and a driving component (120), wherein the sealing box component (100) is arranged at a side of the pump body (10) where the first transmission wheel component (50) and the second transmission wheel component (60) are arranged, a first accommodating cavity is arranged in the sealing box component (100), a first opening is arranged at a side of the sealing box component (100) facing the pump body (10), the first opening is communicated with the first accommodating cavity, and the first transmission wheel component (50) and the second transmission wheel component (60) are both located in the first accommodating cavity;

the seal box component (100) is provided with a shaft hole, the axial direction of the shaft hole is consistent with the length direction of the pump body (10), the shaft hole is arranged corresponding to the first rotor component (20), one end of the shaft hole is communicated with the first accommodating cavity, and the other end of the shaft hole penetrates through the seal box component (100);

the drive part (120) sets up sealed case part (100) is kept away from one side of pump body (10), transmission shaft (110) are located in the shaft hole, the both ends of transmission shaft (110) respectively with first drive wheel part (50) with rotation main shaft (121) of drive part (120) are connected.

8. A high-speed vacuum pump according to claim 7, characterized in that a through hole (111) is provided in the drive shaft (110), one end of the through hole (111) communicating with the first bearing member (40), and the other end of the through hole (111) communicating with the outside of the drive shaft (110).

9. A high-speed vacuum pump according to claim 7, wherein the side wall of the shaft bore is provided with a groove formation (101), and a skeleton oil seal (130) is provided within the groove formation (101).

10. A high-speed vacuum pump according to claim 5, further comprising an end cap (140), wherein the end cap (140) is disposed at a side of the pump body (10) where the third transmission wheel component (70) and the fourth transmission wheel component (80) are disposed, a second accommodating cavity is disposed in the end cap (140), a second opening is disposed at a side of the end cap (140) facing the pump body (10), the second opening is communicated with the second accommodating cavity, and the third transmission wheel component (70) and the fourth transmission wheel component (80) are both located in the second accommodating cavity.

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